remove shell scripts as "," command and auto rebuild

The "go build" is fast but sticky when hit "," command, so I remove it.
I think auto rebuild is not that useful, just fancy.

readme.md

@@ -7,16 +7,5 @@ Personal tools set written in Golang.
 1. Clone this repository to somewhere
 1. Add the root directory to *PATH*
 1. Change directory to the root directory
-1. Run `go run .` to generate "," command
+1. Run `go build -o "," .` to generate "," command
 1. Run "," command to see all commands
-
-"," command can auto rebuild if you change the code in this repository.
-Actually it always builds each time you type it! Because `go build` is
-very fast and it has cache, it's not a problem in terms of speed.
-
-## Q&A
-
-Q: Why generating "," shell script instead of putting it in repository?
-
-A: I like the repository keeps 100% Go source code. I tried writting ","
-shell script as a Go source code with shebang, but it didn't work.